The parcel section of the head post office is in a mess. the parcels that need to be loaded to the vans have been lined up in a row in an arbitrary order of weights. the head post master wants them to be sorted in the increasing order of the weights of the parcels, with one exception. he wants the heaviest (and presumably the most valuable) parcel kept nearest his office. you and your friend try to sort these boxes and you decide to sort them by interchanging two boxes at a time. such an interchange needs effort equals to the product of the weights of the two boxes. the objective is to reposition the boxes as required with minimum effort.

According to the federal regulations, which of the following studies meets the definition of research with human subjects? a researcher conducts a comparison of the comments made in a publicly available blog and the blogger's comments on a similar topic in a weekly magazine. undergraduate students in a field methods class are assigned a research question and asked to interview another classmate, to be followed by a class discussion on interview techniques. a cognitive psychologist enrolls undergraduate students for a computer-based study about the effect of mood on problem-solving behaviors. a researcher sets up a meeting with the superintendent of a large and diverse public school system to get data about the ethnic composition of the school system and the number of students receiving free lunches.